The first thing to do is check how fast your internet connection is. There are several free alternatives including Speedtest.net (ignore the offers to run an app to clean up your Mac — they can do more harm than good). If your download speed is less than 1 to 1.5 Mbps to a nearby test server you need to have a chat with your ISP or you have something haywire in your network. If your Ping time is more than say 20 or 30 ms try changing your DNS server(s) to 208.67.222.222 and 208.67.220.220.

Let us know what you find with the speed tests and then we can go on from there.

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein